Fixture for grinding wheel and tool forms



Aug. 27, 1946. E. MLOONEY FIXTURE FOR GRINDING- WHEEL AND TOOL FORMS 2Sheets $heet 1 Filed Aug. 5, 1944 mnm - wzz/zil'r [Wad/Zia Aug. 27,1946. E. M. LOO NEY FIXTURE FOR GRINDING WHEEL AND TOOL FORMS Filed Aug.5, 1944 2 Sheets-heet 2 .thereon, or for Patented Aug. 27, 1946 UNITEDSTATES PATENT OFFICE.

WHEEL' AND TOOL Edward M. Looney, Watertowm'Mass. v 7 Application August5, 1944;Serial No. 548,157

4 Claims. (01. 51-220) This invention relates to tool holders orfixtures, and more particularly to a, universally adjustable toolfixture forholding tools of various kinds for the sharpening or grindingoperations tours, or for performing various operations.

An object of the invention is to provide an improved universallyadjustable tool fixture, in which the tool carrying member is arrangedto be quickly and easily set in anyone of a plurality of predeterminedpositions.

Another object of the invention "is to provide an improved tool holderfixture including a base and means supported from the base for carryinga tool in a number of desired positions, and in which the tool carryingmeans is readily detachable from the base.

gaging or testing wheel dressing to various confitional views showingthedevice in a plurality of Another object of the invention is to providean improved tool holder fixture in which the tool holding member is,rotatablyvmounted about a predetermined: axis and is formed with a,series of tool receiving openings of various sizes and shapes arrangedin circular array with respect to the axis of rotation of the member.

Another object of the invention is to provide an improved tool holderfixtureincluding a base having a member mounted thereon for horizontalrotation, a second member carried by the first member and arranged forvertical rotation with respect to the first member, a third membercarried by the second member and rotatable relative thereto, theconstruction and arrangement of the parts being such that thehorizontally rotatable member is capable of 'beingdisposed in anydesired predetermined angular relationship on I the base, the secondrotatable member is capable of being disposed in any desiredpredetermined vertica1 angular relationship with the first rotat ablemember, and the third memberis adapted to carry'a tool and disposethe'sa'me in any desired angular position. a

With the foregoing and other objects and advantages in View, theinvention consists the preferred construction and arrangement of theseveral parts'which will be hereinafter fully described and claimed.

In the accompanying'drawlngs: Figure 1 is a front elevation of anadjustable tool fixture embodying the presentinvention, showing the samein one position;

Figure 2 is a vertical transverse sectiontaken along the line 2-2 ofFigure 1;

Figure 3 is a top plan view; r 3 Figures 4; 5 and Bare diagrammaticelevapositions and in association with a grinding wheel; :7

., Figure 7 is. an elevational view showing the device arranged tosupport a tool for the purpose of dressing or truing a grinding wheelhaving a convex periphery; s s

Figure 8 isaview similar to Figure 7 showing thedevice associated with agrinding wheel for Figure 114 is a horizontaljrsection' taken along theline 14 of Figure 13 and V r Figures 15 and 16 are perspective viewsshowing arrangements of the improved adjustable toolfixture-forjpurposes. of testing or gaging work. Referring tothedrawings and especially to Figures 1, 2' and 3, the improvedadjustable tool fixture comprises'a base 2| which may be held by amagnetic chuck or other suitable support,

'such as indicated at 22, Figurev 4, whereby said base is fixed orrigidly held in, a fixed position. The base 2| isforme'd with a vertical'bore 23 in'which is mounted a tubular bushing 24. that constitutes abearing fora trunnionzi depending from the bottom of a memberZB. P

The construction issuch that the member 26 is rotatably mounted on thebase 2| for .horizontal rotation, that is, about a vertical axis.

In 'orderito prevent accidental lateral shifting movement upwardly ofthe pinember 25 W with respect to the base; 2|; the: dependingv portionor trunnion 25 of said membenis formed with an annular grooveZ'Iiwhichregisters with a pair of diametrically disposed openings,28,and 29 .formedin the bushing 24).: r

Formed in the base 2| is a horizontally disposed boreor opening3ll:which alines with the groove 1'21 and opening 28, when the parts'areassembled in th manner shown in Figure 2.; 7

;;A ball 3l isnormally retained in the cavity provided by the groove 21and opening 128v by'a spring 32, mounted in the bore orsopening 30andretamed thereinby a screw threaded plug openingorslot 48;

33 having threaded engagement with a screw threaded portion of said boreor opening. The spring pressed ball acts as a latch, releasable byapplication of sufiicient force to permit disassembly of the member 25and parts carried thereby from the base 2| when desired.

Also formed in the base 21 and diametrically disposed with respect tothe bore or opening3fl,

is a second threaded bore or opening "34 which alines with the groove 21and the opening 29;

A set screw 35 is mounted in the bore or opening34, the inner end ofsaid screw being arranged to be disposed within to. engage the innerwall of said said set screw is turned inwardly tightly,to therebyrigidly retain thermember 2'6 'fromrotating' fixed base 21 .'.when t.dfli a with respect to the I vice is set in a predetermined position.

The main body of the member 26 annular form, as shown best in'Figure 3,with the outer peripheral edge of said member beveled or disposed at anangle and having formed-there,- on'calibrations 36. j

As shown, the calibrations each'degree of a circle,

respect to base 21 may be readily determined by the operator ofthedevice notingthe position of the calibrations 36 with a pointer '31fixedly mounted on the upper surface of the base 2 l.

In Figures 1', 2 and '3 the device is shown with the several adjustableparts thereof set at zero angle positions. 'I'he manner in which thedevice is adapted to be adjusted willbehereinafter V I more fullydescribed. I

"Projecting upwardly from the member 26, i a standard 41 having a pairof vertically disposed parallel'legs 42 and '43; arranged in suitablespaced apart relation so as to receive therebetween an annular member44.

The annular member standard Al for vertical rotation about a-horizontalaxis provided by a pivot pin 45 carried by the legs 42 and 43 r One faceof the member is formed' with.

calibrations 46; and the leg 42 is provided. with an upwardly projectingfinger 41 adapted, duringrotation of the member 44, to indicate theangle at which said mernber is positioned with respect to the verticalstandard.

Formed in the annular member 44 and extendin'ginwardly from the outerperiphery thereof is a slot or opening 43,

, The-slot oropening 4a is'radially disposed "with The post 50 isformedwith a depending portion or trunnion i that passes through anopening 52 in the block 49 and is disposed withinthe At a suitable pointadjacentto the'o'peningior v slot'48', the member 44 is formed with athreaded bore 53 that extends from the periphery of said member inwardlyat an angle and'intersects the opening or s'lot48- at a point adjacentto the-inner endthe'reof.

4 A set screw 54'is mounted 'i-nthe bore 53, the

the annulargroove 2'1 and.

groove when 36 may designate; and the relative position 'or angulararrangement of the member 261with maybe of V inner end of V 4 H the setscrew being arranged gage the trunnion 5! so as to rigidly hold thestandard or post 5%) in a predetermined fixed position relative to theannular member 44, for a purpose to be hereinafter more fully described.

In order to prevent axial shifting movement of the post with respect tothe member 44 when the set screw 54 is out of engagement with thetrunnion 5!, a suitable locking'means is provided.

Thislocki-ng means includes a ball 68 disposedpartly in aperipheralgroove 69 formed in the trunnion 5i, and partly in a socket it in thepost 59 andheldtherein by a set screw 'i-l threaded into the socket 19,as shown in Figure 1. I

I The manner in which the post or standard 5!! ismountedpin the annularmember 44 is such :t tsaid stis angles to the axis of rotation. of theannular rotatable about an axis at right member 44. V

The standard or post 50 has a pair of vertically disposedparallellegs155 and 5B, :arrangedasuitable distance apart so as' to receivetherebetween an annular tool holding member. 51. V

{The-tool holder. 51 is mounted. in the postz'or standard 50 forrotation about an axis provided by :a pivot pin 58 carriedby the legsL55 and 56 at right angles to the rotation axis ortheztrun- One face of;the asthma 5111s lemma calibrations 59, andthe. leg '55 .isprovided-with 7 an upwardly projecting finger GBiadapted; during .44 ismounted in the ;or standard 50., 1

rotation of the .toolxholder 5'! to. indicatethe angle at which saidtooleholderis'positioned with respectto the longitudinal center line ofthe post Formed in the body of the tool holder 51, is a series ofopenings GI, 62', E3, E4, 55 and. 66. As shown in Figure 1 theseopenings are of'various sizes and. configurations soaszto' accommodatetools of-various types." In the present instance,

six tool receiving openings are' vshown formed V in the tool-holder51... These openings are ar-.

ranged. with centers spaced equidistances' apart, or. as: shown, thevcenters-of the openings are] spaced 60 degrees. apart. inrelaticnshipto the location of the calibration 59. l I

'So, thatthe tool. holder predetermined fixed position with respect'tothe post orstandardifl, the leg 56 carriesaset screw 61 which is soarranged that th inner end-of the setscrewcan impinge againstaifa'ce ofthe tool .holderiwhen the set screw is turned intightly, to

thereby prevent rotation of the tool holder with respect to the post orstandard 50. 1

Associated. with each of the openings 61 to-E6 inclusive, areradiallydisposed: setrscrews 1 2 to *IL'inclusive, respectively, which areadapted to indicating Zero angle degrees,-as s'hown' in'Fi retain a toolin fixed position in the tool holder 7, in well known'manner.

.Since the member. 26 is rotatably mounted on the'base 21 for horizontalrotatiornfian'd 'sincethe annular member '44 is mounted on the: member26: for verticall-rotatiomthe tool holdingmember 51. isarranged to be.disposedlin any :number-of predetermined .positions, due to the.-manner *in which said member Elis rotatably suppo'rted,as has beenheretofore; described, and; due. to. 1the provision of means in themember '51 for receiving tools of'various types and sizespthe devic ofthe present invention is capableof being used "in the accurateproduction 'ofi'cutting tools, and it makes it 'possibl'ef'to regr-indorfsharpentools 'of various types and to retain the respeenvegcontoursof the tools so'reground'. By means of the calibrations or graduatedscales which indicate to en- 51- can be retained in a the angles of thevarious settings' ofthe 'device, it is possible to record data for anyform of cut ting tool and to duplicate the tool. 7

It will be noted that adjustment may beeffected about four differentaxes as ,follows: first, the axis of the trunnion 25; second, the axis'of the pivot pin 45 which is perpendicular to and intersects the axisof the trunnion 25; third, the axis of'the trunnion which isperpendicular to and intersects the axis of thepivot pin 45, and,fourth,the axisof the pivot pin 58 which is perpendicular to andintersects the axis of the trunnion 5|; and the axes of the standardslie in the central plane of thetool holder; Because of this relationshipbetween the various axes, angular adjustmentaboutany 01" them at equaldistances on either s'ideaof thezero indication will cause equal andopposite tool adjustment. It is also't'o be noted that the post 50 maybe swung through the vertical and through substantially 120 on eitherside of the vertical. This makes possible adjustment to any of thediscussed positions shown in Figures 4 to 16, inclusive, as well as tomany more not illustrated, and which may be found convenient for specialpurposes.

As shown in Figures 4, 5 and 6, when it is desired to grind or resharpena tool, such as a threading tool 80, the base 2| is mounted on thesupporting element 22 of a grinding machine 8| having a suitablegrinding wheel 82. v The tool holding member 51, with the tool 80mounted in one of the openings 6| to 66 therein, is disposed in thedesired angular relationship with respect to the standard 4|,by-shifting the positions of the members 26, 44 and 51 from the zeroangle position shown in Figures 1, 2 and 3, to the angular arrangementshown in Figures 4, 5 and 6. The surface portion of the tool '80 to bereground or dressed is thus held in the desired position so that whenthe tool 80 is moved into contact with the grinding surface of wheel 82the desired operation will be accurately performed thereon. In Figure 4there is shown the relative position of the parts when the fixture isarranged to sharpen or regrind one side face of a threading tool. Themanner in which the other side face of the threading tool is ground isshown in Figure 5, the tool holding member 51, being turned about itsaxis 58, and the manner in which the tool point is dressed to thedesired front rake is shown in Figure 6, the member 44 being turnedabout its axis 45.

Figures 7to 14, inclusive, show-various positions wherein the device isadapted for use for dressing grinding wheels.

Thus in Figures 7 and 9, by rocking the truing tool 83 clamped in thehole 66 of the disk 51 about the axis of the standard 42 which liesinwardly of the wheel edge the edge of the grinding wheel is truedconvex, while the same action with the parts arranged as shown in Figure8 with the axis of the standard 42 outwardly of the wheel edge, thewheel will be trued concave.

Figures 11 and 12 show a still different arrangement wherein rockingmotion about its axis of the standard 50 will true the grinding wheelconcave, this axis being below the wheel edge.

Figures 13 and 14 show an arrangement wherein by rocking the truing toolabout the pivot 45 a bevel face 84 will be formed on the grinding wheel.

Figure 15 shows the device used in place of a surface gage. It employs ascribing point 86 which may be swung about the axis of the part 42 to'scribe an arc," vin-ahori'z'ontal surfaceof a work-piece 89." 4;,

Figure 16 shows the device used as a support instead of a tool post foran indicatorgage 90 employedto test whether a piece of work is properlycentered with respect to a rotary chuck 9|; Any wabbling of the feelerwill show magnified on the indicator arc. The usual tool post does-nothave the greatfacility of adjustmentto bring thefeeler into gagingposition as does this device. I

It willbe noted that due to the, manner in which. the standard .42 isdetachably connected Y with the base 2|, the portion of the fixture, in-

' with'respect to the base 2|. xWhen .the parts are thus disassembledthe partscan be easily packed in a machiniststoolbox or. the likewithout dim,-

culty, :so that the device is. easily portable. From the foregoingdescription of certain embodiments of this invention, it should beevident to those skilled in the art that various changes andmodifications might be made without departing from the spirit or scopeof this invention as defined by the appended claims.

I claim:

1. In a tool holding fixture, in combination, a base, a member rotatablymounted on said base for horizontal rotation, a standard carried on saidhorizontally rotatable member extending at substantially a right angleto said base, an an- .nular member rotatably mounted in said standardfor vertical rotation with respect to the horizontally rotatable member,a second standard carried by said annular rotatable member and whenvertically extended rotatably mounted for horizontal rotation withrespect to said annular member, said second standard extending radiallyfrom the. periphery of the annular member and having its axis ofrotation alwaysin the same plane as the axis of rotation of the firststandard, and a tool holding member mounted for vertical rotation onsaid second standard when said second standard is vertically extendedand having its axis of rotation intersecting the axis of rotation of thesecond standard.

2. Ina tool holding fixture, in combination,a

base, a member rotatably mounted on said base for horizontal rotation, astandard carried on said horizontally rotatable member extending atsubstantially a right angle to said base, an annularmember rotatablymounted in said standard for vertical rotation with respect to thehorizontally rotatable member, a second standard carried by said annularrotatable member and when vertically extended rotatably mounted forhorizontal rotation with respect to said annular member, said secondstandard extending radially from the periphery of the annular member andhaving its axis of rotation always in the same plane as the axis ofrotation of the first standard, and a tool holding member mounted forvertical rotation on said second standard when said second standard isvertically extended andhaving its axis of rotation intersecting the axisof rotation of the second standard, said first mentioned standard beingcentrally disposed with respect to said hori zontally rotatable member.

3. In a tool holding fixture, in combination, a base, a member rotatablymounted on said base for horizontal rotation, a standard carried on saidhorizontally rotatable member extending at substantially a right angleto said base,an annular member'rotatably mounted in said standardencode-'2' for vertical rotation withrespect to the horizonhaving itsaxis of rotationi'always in *the: same vplane as the axis of rotation ofthe first standard,

and a tool holding member mounted for vertical rotation on said secondstandard and havingits axis'of rotation intersecting the axis ofr'otation of the second standard, said tool holding? member beingmounted for vertical rotation on said second standard axially thereofwhen said'seco'nd st'andaid is vertically extended; i i y ,1

4.In a tool holdingfixture, in combination, a base, a member rotatabl-ymounte'don'isaid base for horizontal rotation, a s'tandard carried: on'

said horizontally rotatable member vextendingT at substantially-a rightangle to said base, arr-annular member rotatably; mounted insaidstandard for Vertical rotation with respect to thehorizontally-rotatable member, a second standard carried by said annularrotatable member and when vertically extended rotatably' mounted forhorizontal rotation with respect to said annular member, said secondstandard'extending radially from the, periphery of the annular memberand-having its axisof rotation always in the same plane as the axis' ofrotation of the first'sta'ndard, anda tool holding member mounted.-for'vertical ,rotation on said second standard when said'seconclstandard is vertically extended and having its axis of rotationintersecting the axis of rotation of the second standard, said secondstandard with .said tool holdingimemberbeing movable through 360degrees. i 1 V v V EDWARD-MVLOONEY,

